Exercise treadmill



FIG. 1 is a perspective view of an exercise treadmill showing my new design;

FIG. 2 is a right side elevational view thereof, the side opposite being substantially a mirror image;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof; and

FIG. 5 is a top plan view thereof.

The bottom of the design is plain and unornamented. 

The ornamental design for an exercise treadmill, substantially as described and shown. 